Every schoolchild knows that milk is a natural source of the calcium needed to build strong bones and healthy teeth. Now grownups may also have a good reason to drink (fat-free) milk. A study published last week in the New England Journal of Medicine suggests that calcium may help protect adults from cancer of the large intestine, a sometimes fatal disease that has afflicted some 138,000 Americans this year--including President Reagan, who had surgery to remove a cancerous growth from his colon last July.
Colon cancer has been linked to high-fat diets; fatty foods increase the production of bile acids, which...